排序方式： 共有203条查询结果，搜索用时 15 毫秒
171.
目的：探讨肺癌小鼠CD4＋T细胞、CD8＋T细胞和骨髓源性抑制细胞（ MDSC）的比例和数量变化。方法：采用LLC细胞皮下接种制备小鼠肺癌肿瘤模型,流式细胞仪检测肿瘤小鼠骨髓、脾脏、淋巴结内CD4＋T细胞、CD8＋T细胞和MDSC的数量变化。结果：与正常对照小鼠相比,肿瘤小鼠脾脏、淋巴结内CD4＋T细胞、CD8＋T细胞的比例和数量显著降低,骨髓CD4＋T细胞变化不明显,但CD8＋T细胞显著减少。 MDSC 在肿瘤小鼠骨髓、脾脏和淋巴结内的比例和数量则显著增加。结论：肺癌小鼠T细胞数量降低而MDSC细胞数量增加,诱导对肿瘤细胞的免疫耐受。 相似文献
172.
棒球投手肩关节旋转运动特征研究 总被引：2，自引：0，他引：2
何勇 《山东体育学院学报》2006,22(3):107-109
棒球比赛中,投手是一支球队的灵魂,在很大程度上决定全局的比赛。肩部力量素质和活动范围是投手有效投球的基础,在很大程度上决定投球技术、机能的发挥。肩关节既是躯干和上肢的连结点,又是上肢运动的支点,是保证上肢完成三维活动的重要结构[1]。因此,肩关节在棒球运动中发挥着 相似文献
173.
我国优秀棒球投手上肢运动的检测分析 总被引：2，自引：0，他引：2
目的:以探讨棒球投手肩关节旋转运动特征.方法:通过应用一种超声波动力学测量仪和等速仪器分别对25名棒球投手和25名自愿者肩关节内、外旋活动范围(range of motion,ROM)、内外旋肌力进行测量.结果:棒球投手优势臂的外旋活动范围明显大于非优势臂,而其优势臂的内旋活动范围则显著小于非优势臂,优势臂的整个旋转活动范围也明显比非优势臂小;对照组的优势臂和非优势臂旋转活动范围差异无显著性,棒球投手肩关节存在内、外旋肌力不平衡,实验组优势臂内旋IR(210°/s)、IR(300°/s)相对峰力矩明显大于非优势臂(P＜0.001),优势臂外旋ER(210°/s)、ER(300°/s)峰力矩与非优势臂相比,无明显差异(P＞0.05),实验组优势臂外旋/内旋峰力矩比值(ER/IR)明显小于非优势臂. 相似文献
174.
This study aimed to explore the molecular mechanism in tumor invasion and metastasis. The expression of matrix metalloproteinase-2,
−9 (MMP-2, MMP-9), tissue inhibitor-1 of matrix metalloproteinase (TIMP-1), cell adhesion molecule 44 variant 6 (CD44v6),
HER2/neu and p53 was investigated in 154 patients with head and neck squamous cell carcinoma (SCC) by ABC and ImmunoMax immunohistochemical
method. Their clinical relevance and correlation were analysed. The expression of MMP-2, MMP-9, TIMP-1, CD44v6, HER2/neu and
p53 was found in cancer cells in 87.01%, 85.71%, 68.18%, 98.05%, 55.19% and 50.65% cases respectively. Linear regression and
correlation analysis revealed that there was close positive relationship (P<0.05) between the expression of MMP-2 and MMP-9, TIMP-1 and CD44v6, HER2/neu and MMP-9, MMP-2 and p53. Up-regulation of MMP-2
was accompanied by advanced T stage (P<0.01). There was also a trend of MMP-2 expression being related with tumor metastasis. Increased expression of HER2/neu was
found in patients with tumor recurrence (P<0.05). The expression of TIMP-1 was higher in laryngeal cancer than that in pharyngeal cancer, and higher in keratinizing
and non-keratinizing SCC than that in basaloid SCC (P<0.05). These findings suggested that MMP-2 and MMP-9, HER2/neu and MMP-9, MMP-2 and p53 had a coordinate function in aggression
of tumor; that MMP-2 had a more important function than MMP-9 in tumor invasion and metastasis; and that HER2/neu might serve
as a biomarker for poor prognosis in HNSCC.
Project supported by Lübeck Medical University, Germany 相似文献
175.
姚多岚 《淮南职业技术学院学报》2002,2(2):65-67,77
按照信息记录载体出现的先后顺序，介绍了信息记录载体的各种类型以及自的优缺点，并在相互之间作了比较研究，由此得出各种信息记录载体形式并存的结论。 相似文献
176.
李新荣 《四川教育学院学报》2006,22(11):60-60,64
BIOS和CMOS在各种“电脑组装与维护”教材中是一个模糊并且很容易混淆的概念。文章着重从硬件、软件两方面阐述BIOS的功能及BIOS的硬件载体。加深对这方面知识的理解。 相似文献
177.
人电击死后血管内皮细胞P-选择素(CD62P)变化的研究 总被引：1，自引：0，他引：1
[目的]通过观察电击死后人心肌中血管内皮细胞P-选择素(CD62P)的改变,寻找其特异性改变指标,探讨其在电击损伤法医学鉴定及临床电击伤的诊断、治疗中的意义。[方法]对三十组尸体标本(实验组15组,对照组15组)进行HE染色以及免疫组化分析,通过HE染色以及免疫组织化学方法观察组织切片内血管内皮细胞黏附分子CD62P的改变。[结果]电击致死人的CD62P在绝大多数组织切片内有一定程度的增加。[结论]血管内皮细胞上P-选择素(CD62P)的改变可以作为电击损伤的辅助性鉴定依据,并可以为临床电击伤诊断和治疗提供方向、依据。 相似文献
178.
Probability density function (PDF) method is proposed for analysing the structure of the reconstructed attractor in computing the correlation dimensions of RR intervals of ten normal old men.PDF contains important information about the spatial distribution of the phase points in the reconstructed attractor.To the best of our knowledge, it is the first time that the PDF method is put forward for the analysis of the reconstructed attractor structure.Numerical simulations demonstrate that the cardiac systems of healthy old men are about 6-6.5 dimensional complex dynamical systems.It is found that PDF is not symmetrically distributed when time delay is small, while PDF satisfies Gaussian distribution when time delay is big enough.A cluster effect mechanism is presented to explain this phenomenon.By studying the shape of PDFs, that the roles played by time delay are more important than embedding dimension in the reconstruction is clearly indicated.Results have demonstrated that the PDF method represents a promising numerical approach for the observation of the reconstructed attractor structure and may provide more information and new diagnostic potential of the analyzed cardiac system. 相似文献
179.
李香萍 《天津工程师范学院学报》2005,(3)
提出了一种采用现场可编程门阵列器件FPGA实现定点IIR低通数字滤波器的方案,该方案采用只读存储器ROM查找表的位串行分布式算法,极大地减少硬件电路的规模,提高了电路的执行速度。以一个四阶IIR低通数字滤波器电路的实现为例,说明了设计过程,对所设计的电路进行了验证。结果表明,电路工作正确可靠,满足了设计要求。 相似文献
180.
依据有关国家标准,对学术期刊（光盘版）编排规范存在的问题与缺陷予以阐释;同时,举例分析了因编者对规范的错误解读所导致的执行偏差。 相似文献